JP2004039073A - Reference signal generating device in magnetic recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a reference signal for making a recording wavelength and a pulse interval which are to be recorded on a tape recording medium constant even when the traveling speed of the recording medium is changed. <P>SOLUTION: In this magnetic recording device, a recording head 13 and a reproducing head 15 are arranged in the traveling direction of a recording medium 11. A recording and reproduction control part 29 prepares a recording pulse signal in a waveform shaping part 19 with the instruction of a start instructing part 17 and outputs it to the recording head 13 via a changeover part 21 and a recording amplifier 25. The recording head 13 records the recording pulse signal and the reproducing head 15 reproduces it as a reproduction signal. The control part 29 shapes the waveform of the reproduction pulse signal in the waveform shaping part 19 and forms a next recording pulse signal and outputs it to the recording head 13. A reference signal forming part 23 locks an oscillation high frequency which is oscillated in the inside by the phase of the reproduction pulse signal and outputs it as a reference signal. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reference signal generator in a magnetic recording device, and more particularly to a reference signal generator suitable for use in accurate recording of, for example, a servo pattern on a tape-shaped recording medium (magnetic tape) in a magnetic recording device.
[0002]
[Prior art]
In general, a tape-shaped recording medium for recording digital image information data, audio information data, etc., uses servo information such as tape position information in addition to the digital data to a specific magnetization pattern (servo) in order to improve the recording density. It is known that a pattern is written on a plurality of linear recording tracks (servo tracks), and a recording / reproducing apparatus performs position control, running control, and the like based on the servo information.
[0003]
The following method is being studied as a method for writing a servo pattern on a predetermined linear recording track of a tape-shaped recording medium.
[0004]
That is, as shown in FIG. 3, a recording head 3 having a width sufficiently larger than its recording width is arranged on the upstream side of the tape-shaped recording medium 1 so as to be orthogonal to the running direction D, and on the downstream side of the recording head 3, Similarly, a wide erasing head 5 is arranged obliquely, and an information vertical pattern 7 is repeatedly written at a predetermined timing on the tape-shaped recording medium 1 in contact with the recording head 3, and the erasing head is written on the tape-shaped recording medium 1. The servo pattern 9 in which the parallelogram-shaped unit information Z is linearly arranged in an oblique direction by erasing the information vertical pattern 7 and erasing it at a predetermined recording width as shown in FIG. It is.
[0005]
Then, the servo pattern 9 is read from the tape-shaped recording medium 1 during recording or reproduction, and is used for servo control of a position control system of a recording / reproducing head (not shown) or a traveling system of the tape-shaped recording medium 1.
[0006]
Such a method of writing the servo pattern 9 has the advantage that the write accuracy is improved, so that an individual recording head corresponding to each linear recording track is not required, the configuration is simple, and the cost can be easily reduced.
[0007]
In addition, the symbols An, An + 1, An + 2 which are the information vertical patterns 7 in FIGS. 3 and 4 are specifically servo signal information, the symbols Bn, Bn + 1, Bn + 2 are identification signal information (servo timing marks), and the symbol TCn , TCn + 1, TCn + 2 are linear servo tracks, and for convenience, servo signal information An to An + 2,... And identification signals Bn to Bn + 2,.
[0008]
[Problems to be solved by the invention]
However, although the servo pattern 9 described above has a useful advantage, if the information vertical pattern 7 that is geometrically aligned is not written while minimizing the variation in the writing interval, the desired accurate servo control can be secured. Or it becomes difficult to improve the track density.
[0009]
For example, as shown in FIG. 5A, the positional relationship in which the individual unit information Z of the servo pattern 9 is aligned with the position of the symbol R in the figure and the lower end thereof overlaps the track center TC (n) of the linear servo track TCn is normal. In the case where the recording position is set to an appropriate value, the formation width of some unit information Z fluctuates due to the speed deviation, fluctuation, jitter, etc. of the running system of the tape-shaped recording medium 1 as shown in FIG. In this case, even if the reproducing head (not shown) is positioned at the track center TC (n) at the time of reproducing, an erroneous signal indicating that the reproducing head (not shown) is shifted by Pe is output.
[0010]
As a result, the servo mechanism operates due to the erroneous signal, and the recording / reproducing head cannot converge to the target position, which hinders accurate servo control of the tape-shaped recording medium 1 and makes it difficult to improve the track density. It is necessary to minimize variations in servo signal formation positions and variations in intervals.
[0011]
As described above, when the servo pattern 1 is recorded on the tape-shaped recording medium 3, how much the deviation Re can be reduced is an important factor for determining the track density.
[0012]
Of course, if the speed accuracy of the traveling system of the tape-shaped recording medium 1 is improved, it may be possible to form the servo pattern 9 which is geometrically uniform. However, since the formation accuracy of the servo pattern 9 is highly required, There is a limit to solving the problem only with the driving system, and there is room for improvement.
[0013]
The present invention has been made to solve such a problem, and an object of the present invention is to provide a reference signal generator that generates a reference signal that can be used for servo control correction of a tape-shaped recording medium.
[0014]
[Means for Solving the Problems]
In order to solve such a problem, the present invention is arranged at a predetermined position in the running position of the tape-shaped recording medium in the magnetic recording device on the upstream and downstream sides, and contacts the tape-shaped recording medium to A pair of a recording head and a reproducing head for magnetically recording and reproducing information, and a predetermined recording pulse signal to be recorded on the tape-shaped recording medium is output to the recording head side, and at the time of passing through the tape-shaped recording medium. A recording / reproduction control unit for capturing the recording pulse signal reproduced by the reproduction head as a reproduction pulse signal, and a recording / reproduction control unit for outputting a next recording pulse signal to the recording head based on the timing of capturing the reproduction pulse signal; Oscillates a predetermined high-frequency signal and outputs a signal obtained by phase-locking the oscillated high-frequency signal with the reproduced pulse signal as a reference signal. It is provided with a reference signal forming unit.
[0015]
According to the present invention, as the reference signal forming section, a synchronization pulse signal synchronized with the reproduction pulse signal is formed, and based on the synchronization pulse signal, a detection loss of the reproduction pulse signal is detected and a detection signal is output. The recording / reproduction control unit outputs the next recording pulse signal to the recording head based on the reproduction pulse signal, and outputs the synchronization pulse signal as the next recording pulse signal when the detection signal is input. It is also possible to form it.
[0016]
Further, according to the present invention, the reference signal forming section is formed to output a synchronization pulse signal synchronized with the reproduction pulse signal, and the recording and reproduction control section outputs the synchronization pulse signal as a next recording pulse signal. It is also possible to form it.
[0017]
Further, according to the present invention, as the reference signal forming section, a signal obtained by dividing the frequency of the oscillating high-frequency signal by 1 / N (N is a positive integer, the same applies hereinafter) is compared with the reproduction pulse signal, and the phase difference is determined. The frequency of the oscillating high-frequency signal may be varied accordingly, and the frequency may be divided into 1 / M (M is a positive integer, the same applies hereinafter) and output as the reference signal.
[0018]
Furthermore, in the present invention, the reference signal may be a reference signal for recording a servo pattern signal on a tape-shaped recording medium, or a signal for correcting travel of the tape-shaped recording medium.
[0019]
In particular, according to the present invention, a recording head having a width sufficiently larger than its recording width is disposed on the upstream side of the tape-shaped recording medium so as to be orthogonal to the traveling direction, and a wide erasing head is inclined diagonally downstream from the recording head. It is arranged, and the recording head repeatedly writes the information vertical pattern on the tape-shaped recording medium at a predetermined timing, and the erasing head erases the vertical pattern information and erases it with a predetermined recording width and arranges it diagonally linearly. In a servo pattern forming apparatus for forming a servo pattern formed as described above, the above-described reference signal generating device is mounted, and is suitable for a configuration in which the reference signal is used for writing timing of the servo pattern.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
FIG. 1 is a block diagram showing an embodiment of a reference signal generator according to the present invention. In FIG. 1, the tape-shaped recording medium 11 is a conventionally known one and is driven and controlled in a direction indicated by an arrow d (a running direction) by a predetermined running system (not shown), but is not a main part of the present invention. And illustration is omitted.
[0022]
The recording head 13 is disposed upstream of the tape-shaped recording medium 11 in the running direction d so as to contact the same, and the reproducing head 15 is disposed downstream of the recording head 13 so as to contact the tape-shaped recording medium 11. Have been.
[0023]
The recording head 13 and the reproducing head 15 have a configuration suitable for recording and reproducing a recording pulse signal to be described later on and from the tape-shaped recording medium 11, and are supported by supporting means (not shown). In FIG. 1, the tape-shaped recording medium 11 is illustrated so as to overlap with the tape-shaped recording medium 11, but is separated from the tape-shaped recording medium 11.
[0024]
The recording head 13 and the reproducing head 15 are arranged integrally or separately in the vicinity of the running direction y of the tape-shaped recording medium 11, and preferably dozens to hundreds of microns so as not to pick up signal noise of each other. They may be integrally formed at meter intervals or separately arranged at intervals of about 1 mm.
The start instruction unit 17 outputs a start signal in accordance with an instruction from the traveling system when the traveling operation is stabilized, and is connected to the waveform shaping unit 19.
[0025]
The waveform shaping unit 19 outputs one recording pulse signal based on a start signal from the start instruction unit 17 or a reproduced pulse signal whose waveform is shaped as described later. It is connected to the unit 23.
[0026]
The switching unit 21 outputs a recording pulse signal from the waveform shaping unit 19. When a switching signal is input from the reference signal forming unit 23, the switching unit 21 converts the recording pulse signal from the reference signal forming unit 23 into a reference signal forming signal. The output is switched to a synchronizing pulse signal to be described later from the section 23, and is connected to the recording head 13 via a recording amplifier 25 for amplifying the recording pulse signal.
[0027]
The recording head 13 records the recording pulse signal on the tape-shaped recording medium 11 as described above, and the recording pulse signal P1 is recorded on the tape-shaped recording medium 11. FIG. 1 shows a state in which the recording head 13 records the next recording pulse signal P2.
[0028]
The reproducing head 15 reproduces the recording pulse signal P1 recorded on the tape-shaped recording medium 11, and is connected to the above-mentioned waveform shaping section 19 via a reproducing amplifier 27 that amplifies the reproducing signal.
[0029]
The waveform shaping section 19 forms a single recording pulse signal by shaping the waveform of the reproduction pulse signal from the reproduction amplifier 27 in addition to the functions described above, and records the recording pulse signal via the switching section 21 and the recording amplifier 25. It has a function of outputting to the head 13 and a function of outputting a reproduction pulse signal to the reference signal forming unit 23.
[0030]
A recording / reproduction control unit 29 is formed by the start instruction unit 17, the waveform shaping unit 19, the switching unit 21, the recording amplifier 25, and the reproduction amplifier 27.
[0031]
Therefore, when the recording pulse signal P1 is reproduced by the reproducing head 15, the waveform is shaped into one recording pulse signal P2, and the tape-shaped recording medium 11 is transmitted by the recording head 13 via the switching unit 21 and the recording amplifier 25. , And a recording and reproduction loop of the next recording pulse signal is formed in accordance with the reproduction timing of the recording pulse signals P1, P2,..., And the recording pulse signals P1, P2,. Recorded and played back.
[0032]
The time delay from the reproduction of the recording pulse signals P1, P2,... To the recording is almost negligible with respect to the recording pulse signal interval, and the distance between the pulses recorded on the tape-shaped recording medium 11 is the recording head. The distance is the same as the distance between the recording head 13 and the reproducing head 15, and this distance does not depend on the feeding speed or fluctuation of the tape-shaped recording medium 11, and further, on the jitter.
[0033]
The reference signal forming unit 23 in FIG. 1 includes a PLL unit 31 and a missing detection unit 33.
[0034]
The PLL section 31 has a function of oscillating a high-frequency signal of a predetermined frequency, locking the oscillated high-frequency signal with the phase of the reproduction pulse signal from the waveform shaping section 19, and outputting the high-frequency signal as a reference signal. .
[0035]
The reference signal output from the PLL unit 31 is such that a speed deviation or fluctuation occurs in the tape-shaped recording medium 11 by locking the phase of a predetermined oscillating high-frequency signal with the above-described continuously generated reproduction pulse signal. Also, the recording length on the tape-shaped recording medium 11 can be made constant.
[0036]
That is, when the speed of the tape-shaped recording medium 11 decreases, the frequency of the reproduction pulse signal decreases and similarly decreases when the speed of the tape-shaped recording medium 11 decreases, and when the speed increases, the frequency of the reproduction pulse signal increases. And it goes up as well.
[0037]
The PLL unit 31 has a function of constantly generating a synchronization pulse signal (of the same frequency) synchronized with the reproduction pulse signal, and outputting the synchronization pulse signal to the switching unit 21 and the missing detection unit 33.
[0038]
The missing detection unit 33 has a function of synchronously detecting the recording pulse signal from the waveform shaping unit 19 and the synchronization pulse signal from the PLL unit 31. If the recording pulse signal overlaps with the synchronization pulse signal from the PLL unit 31, When there is no recording pulse signal to be inputted in relation to the synchronizing pulse signal synchronized with the reproducing pulse signal, the lack of the recording pulse signal is detected and the switching signal is output to the switching unit 21. And a function of holding the recording pulse signal until it is input from the waveform shaping section 19.
[0039]
Such a situation is a case where a reproduction pulse signal is not obtained due to, for example, a defect of the tape-shaped recording medium 11 and a recording / reproduction loop is not formed.
[0040]
When the switching signal from the loss detecting unit 33 is input, the switching unit 21 described above uses the synchronization pulse signal from the PLL unit 31 as a recording pulse signal to the tape recording medium 11 via the recording amplifier 25 and the recording head 13. It has a switching function of recording and outputting a recording pulse signal from the waveform shaping section 19 to the recording amplifier 25 when there is no input of a switching signal.
[0041]
In addition, from the viewpoint of ensuring a reliable detection operation, even when one recording pulse is not input, the missing detection unit 33 does not immediately output the switching signal and operates so as to wait for the next recording pulse missing detection. It is also possible.
[0042]
Next, the operation of the above-described reference signal generator will be described.
Initially, when the traveling of the tape-shaped recording medium 11 mounted on a magnetic recording device (not shown) reaches a predetermined speed, a start signal is output from the start instruction unit 17 to the waveform shaping unit 19 based on an instruction from the traveling system.
[0043]
The waveform shaping section 19 outputs one recording pulse signal P1 to the switching section 21 based on the start signal. In this state, since the switching signal has not been output from the missing detection unit 33, the recording pulse signal P1 is output to the recording head 13 via the switching unit 21 and the recording amplifier 25, and the recording pulse signal P1 is output to the traveling tape-shaped recording medium 11. Is recorded with a recording pulse signal P1.
[0044]
The recording pulse signal P <b> 1 arriving at the reproducing head 15 by the travel of the tape-shaped recording medium 11 is reproduced and input to the waveform shaping unit 19 via the reproducing amplifier 27.
[0045]
The waveform shaping unit 19 shapes the waveform of the reproduction pulse signal P1 from the reproduction amplifier 27 to form the next recording pulse P2, and outputs the recording pulse P2 to the recording head 13 via the switching unit 21 and the recording amplifier 25. A recording pulse P2 is recorded on the tape-shaped recording medium 11.
[0046]
Thereafter, if a recording / reproduction loop is formed, the next recording pulse signal is recorded in synchronization with the reproduction timing of the recording pulse signal, and the reproduction is repeated.
[0047]
The waveform-shaped reproduced pulse signal is applied from the waveform shaping section 19 to the PLL section 31 of the reference signal forming section 23. In the PLL section 31, the oscillation high-frequency signal is locked at the phase of the reproduced pulse signal, and this is recorded in a pattern. It is output to the control unit 35 as a reference signal.
[0048]
Therefore, the pattern recording control unit 35 variably controls the write timing of the servo pattern 9 using the reference signal and controls the recording head 3 in FIG. Regardless, the servo pattern 9 (the information vertical pattern 7) having the same geometric width is recorded on the tape-shaped recording medium 11.
[0049]
The synchronization pulse signal synchronized with the reproduction pulse signal is output from the PLL unit 31 to the switching unit 21 and the loss detection unit 33, while the waveform-shaped recording pulse signal is also output to the loss detection unit 33. When the pulse signal is missing, the missing detection unit 33 detects it and outputs a switching signal to the switching unit 21.
[0050]
Therefore, when the reproduction pulse signal, that is, the recording pulse signal is lost, the synchronization pulse signal from the PLL unit 31 is output to the switching unit 21 and the loss detection unit 33 instead of the recording pulse signal from the waveform shaping unit 19, and this is the recording pulse signal. Is recorded on the tape-shaped recording medium 11 via the recording head 13.
[0051]
As described above, the reference signal generator described above arranges the recording head 13 on the upstream side in the running direction of the tape-shaped recording medium 11 and the reproduction head 15 on the downstream side, and records the recording pulse signal from the waveform shaping section 19. The recording is performed on the tape-shaped recording medium 11 by the head 13, the reproduced pulse signal from the reproducing head 15 is shaped into the next recording pulse signal by the above-mentioned waveform shaping section 19, and is recorded on the tape-shaped recording medium 11 via the recording head 13. The recording / reproducing control unit 29 for sequentially recording is formed, and the reference signal forming unit 23 locks the internally oscillated high-frequency signal with the phase of the reproduced pulse signal and outputs the locked signal as a reference signal. The frequency of the reference signal output from the section 23 changes exactly following the change in the speed of the tape-shaped recording medium 11.
[0052]
Therefore, when the write timing signal of the servo pattern 9 is controlled using this reference signal, the servo pattern 9 recorded on the tape-shaped recording medium 11 is geometrically changed even if the running speed of the tape-shaped recording medium 11 changes. It can be kept constant.
[0053]
That is, when a signal is recorded on the tape-shaped recording medium 11 using the reference signal by the reference signal generating device according to the present invention, the recorded signal is recorded on the tape-shaped recording medium 11 regardless of the speed fluctuation. While a signal with a constant distance is recorded, when a recording signal is erased by the erasing head, a desired signal can be obtained without depending on the speed fluctuation of the tape-shaped recording medium 11 by using this reference signal as a reference timing. Can be accurately erased, and the above-described servo pattern 9 can be recorded and formed in a geometrically accurate and orderly manner.
[0054]
Further, the reference signal forming section 23 has a function of outputting a synchronization pulse signal synchronized with the reproduction pulse signal and outputting a switching signal when detecting the lack of the recording pulse signal. 21. The recording pulse signal from the waveform shaping section 19 is output to the recording head 13 via the switching section 21. When the switching signal is output, the switching section 21 converts the synchronization pulse signal into the recording pulse signal. The recording and reproducing of the recording pulse signal is secured even if the reproducing pulse signal from the tape-shaped recording medium 11 is lost, so that the speed of the tape-shaped recording medium 11 is changed. It is possible to reliably obtain a reference signal that changes according to the above, and the above-described effects can be obtained.
[0055]
In the present invention, when the lack of the reproduction pulse signal is detected by the reference signal forming unit 23, the switching signal is output to switch from the recording pulse signal to the synchronization pulse signal, and the switching signal is recorded on the tape-shaped recording medium 11. The following configuration is also possible.
[0056]
In other words, the configuration is such that the synchronization pulse signal synchronized with the reproduction pulse signal from the reference signal forming unit 23 is output directly to the switching unit 21 or to the recording amplifier 25 as a recording pulse signal.
[0057]
Even in such a configuration, since the synchronization pulse signal is synchronized with the reproduction pulse signal, the frequency of the reference signal output from the reference signal forming unit 23 changes following the change in the speed of the tape-shaped recording medium 11. Thus, the above-described effects can be obtained, and the switching signal is not required.
[0058]
FIG. 2 is a main block diagram showing another embodiment of the reference signal generator according to the present invention.
[0059]
FIG. 2 shows another reference signal forming unit 37 which is a modification of the above-described reference signal forming unit 23. This reference signal forming unit 37 includes an original reference signal generating PLL 37a, a 1 / N-ary counter 37b, and a comparing unit. 37c and a 1 / M-ary counter 37d.
[0060]
That is, the reproduction pulse frequency from the waveform shaping section 19 can be obtained by a number obtained by dividing the speed of the tape-shaped recording medium 11 by the distance between the reproduction heads 13 and 15, and recording the servo signal that is the source of the servo pattern 9. The reference clock frequency required for the servo pattern 9 is determined from the necessity of the servo pattern 9. Therefore, in order to obtain this reference clock frequency, it is necessary to match the reproduction pulse frequency, and the distance between the recording / reproduction heads 13 and 15 is adjusted. However, this adjustment is likely to be complicated, and in order to avoid this adjustment, a configuration is shown in which the 1 / N and 1 / M-ary counters 37b and 37d are used to perform the adjustment.
[0061]
The reproduction pulse frequency from the waveform shaping unit 19 is determined by the speed of the tape-shaped recording medium 11 and the distance between the recording and the reproduction heads 13 and 15. For example, when this frequency is set to 166 KHz and the clock for recording the servo pattern is set to 1 MHz, the relationship between the above-mentioned symbols N and M is as follows.
[0062]
The original reference signal generating PLL 35a is frequency-divided into 1 / N by a 1 / N-ary counter 35b and sent to a comparator 35c to lock the phase to a reproduction pulse frequency of 166 KHz and simultaneously output to the switching unit 21 and the defect detection unit 33. I do. Here, when the code N is set to 1000, the original reference signal generating PLL 35a oscillates at 166 MHz. When the frequency is divided by the 1 / M-ary counter 35d with the code M set to 166, the output becomes 1 MHz. This can be used as a reference clock for recording a servo pattern.
[0063]
As described above, according to the present invention, even if the distance between the recording and reproducing heads 13 and 15 is not finely adjusted, the set values of the frequency division numbers N and M of the 1 / N and 1 / M-advance counters 37b and 37d can be changed. A clock having a desired frequency can be obtained only by changing the clock, an error can be suppressed to a predetermined negligible range, and an accurate reference signal can be generated.
[0064]
Further, the reference signal generated by the above-described reference signal generating device according to the present invention has a remarkable effect when the servo pattern 9 is formed, as the recording density becomes higher, but the reference signal can be widely applied to other magnetic recording devices. It is.
[0065]
For example, although not shown, the above-described reference signal generator according to the present invention outputs the reference signals from the reference signal forming units 23 and 35 to the traveling system of the tape-shaped recording medium 11 to indicate the actual motor speed. If the rotation of the motor is controlled so as to reduce the deviation from the signal, the tape-shaped recording medium can be run stably. That is, it is possible to use the reference signal as a signal for correcting travel of the tape-shaped recording medium.
[0066]
【The invention's effect】
As described above, the present invention has the following effects.
According to a first aspect of the present invention, a pair of a recording head and a reproducing head are arranged upstream and downstream at a predetermined distance from a running position of a tape-shaped recording medium in a magnetic recording apparatus, and the tape-shaped recording medium is provided. A predetermined recording pulse signal to be recorded on the medium is output to the recording head side, and the recording pulse signal reproduced by the reproducing head when passing through the tape-shaped recording medium is captured as a reproduction pulse signal, and the reproduction pulse signal is captured. Forming a recording / reproducing control unit for outputting the next recording pulse signal to the recording head side based on the timing, and forming a reference signal forming unit for outputting a reference signal in which a predetermined oscillation high frequency signal is locked in phase with the reproducing pulse signal. Was configured.
Therefore, even if the running speed of the tape-shaped recording medium fluctuates, it is possible to obtain an accurate reference signal that follows the running fluctuation of the tape-shaped recording medium. When used as a reference signal for recording timing, it is possible to make the recording wavelength and pulse distance of a recording signal recorded on a tape-shaped recording medium constant.
The invention according to claim 2 of the present invention is characterized in that the reference signal forming section forms a synchronous pulse signal synchronized with the reproduced pulse signal, and detects and detects the lack of reproduction of the reproduced pulse signal based on the synchronous pulse signal. The recording / reproduction control unit outputs the next recording pulse signal to the recording head based on the reproduction pulse signal, and when the detection signal is inputted, outputs the synchronization pulse signal to the next recording pulse signal. Since it is formed so as to be output as a pulse signal, even if the reproduction pulse signal is lost, it is possible to always obtain an accurate reference signal that follows the running fluctuation of the tape-shaped recording medium.
According to a third aspect of the present invention, the reference signal forming section is configured to output a synchronization pulse signal synchronized with the reproduction pulse signal, and the recording and reproduction control section is configured to output the synchronization pulse signal to the next recording. Since it is formed so as to be output as a pulse signal, even if the reproduction pulse signal is lost, it is possible to always obtain an accurate reference signal that follows the running fluctuation of the tape-shaped recording medium, eliminating the need for a switching signal. Is also simplified.
According to a fourth aspect of the present invention, as the reference signal forming section, a signal obtained by dividing the oscillating high-frequency signal by 1 / N and the reproduction pulse signal are compared, and the oscillating high-frequency signal is determined according to the phase difference. Is varied and divided into 1 / M to be output as the reference signal. By appropriately selecting the codes N and M, variations in the arrangement interval between the recording head and the reproducing head can be obtained. Even if it occurs, it is absorbed to a negligible extent, and an accurate reference signal that follows the running fluctuation of the tape-shaped recording medium can be obtained.
In the invention according to claim 5 of the present invention, since the reference signal is a reference signal for recording a servo pattern signal on a tape-shaped recording medium, the tape-shaped recording medium can be moved even if the running of the tape-shaped recording medium fluctuates. From the viewpoint of recording data into a disk, it is possible to record an accurate servo pattern that is geometrically aligned, and to perform an accurate servo control.
In the invention according to claim 6 of the present invention, since the reference signal is a travel correction signal of the tape-shaped recording medium, the variation of the travel of the tape-shaped recording medium is suppressed small and fast, and the viewpoint of the travel control of the tape-shaped recording medium is reduced. Therefore, it is possible to record an accurate servo pattern that is geometrically aligned, and to perform an accurate servo control.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a reference signal generator according to the present invention.
FIG. 2 is a main block diagram illustrating another configuration of the reference signal forming unit in the reference signal generator of FIG. 1;
FIG. 3 is a diagram illustrating a servo pattern that is a reference of the present invention.
FIG. 4 is a diagram illustrating a servo pattern that is a reference of the present invention.
FIG. 5 is a diagram illustrating a servo pattern that is a reference of the present invention.
[Explanation of symbols]
1, 11 ... tape-shaped recording medium, 3, 13 ... recording head, 5, 15 ... erasing head, 7 ... information vertical pattern, 9 ... servo pattern, 17 ... start instruction section, 19 ... waveform Shaping unit, 21 Switching unit, 23, 37 Reference signal forming unit, 25 Recording amplifier, 27 Reproduction amplifier, 29 Recording / reproduction control unit, 31 PLL unit, 33 Missing detection , 35... Pattern recording control unit, 37 a, PLL for generating original reference signal, 37 b, 1 / N-ary counter, 37 c, comparison unit, 37 d, 1 / M-ary counter, An, An + 1, An + 2 ... Servo signal information, Bn, Bn + 1, Bn + 2 ... Identification signal information (servo timing mark), TCn, TCn + 1, TCn + 2 ... linear recording track, TC (n), TC (n + 1), TC (n + 2) ... tra Click Center, D, d ...... traveling direction, Z ...... unit information

Claims (6)

A recording head and a reproducing head which are arranged upstream and downstream at predetermined intervals at a running position of a tape-shaped recording medium in a magnetic recording apparatus, and which contact the tape-shaped recording medium and magnetically record and reproduce information thereon. Head and
A predetermined recording pulse signal to be recorded on the tape-shaped recording medium is output to the recording head side, and the recording pulse signal reproduced by the reproducing head when passing through the tape-shaped recording medium is captured as a reproduction pulse signal. A recording / reproduction control unit that outputs the next recording pulse signal to the recording head based on the timing of capturing the reproduction pulse signal;
A reference signal forming unit that oscillates a predetermined high-frequency signal and outputs a signal obtained by phase-locking the oscillation high-frequency signal with the reproduction pulse signal as a reference signal;
A reference signal generator in a magnetic recording apparatus, comprising: The reference signal forming section is configured to form a synchronization pulse signal synchronized with the reproduction pulse signal, to detect a reproduction lack of the reproduction pulse signal based on the synchronization pulse signal, and to output a detection signal, The control unit is configured to output the next recording pulse signal to the recording head side based on the reproduction pulse signal, and to output the synchronization pulse signal as the next recording pulse signal when the detection signal is input. 2. A reference signal generator for a magnetic recording apparatus according to claim 1, wherein: The reference signal forming unit is formed to output a synchronization pulse signal synchronized with the reproduction pulse signal, and the recording and reproduction control unit is formed to output the synchronization pulse signal as the next recording pulse signal. Item 2. A reference signal generator in the magnetic recording device according to Item 1. The reference signal forming unit compares the reproduction pulse signal with a signal obtained by dividing the oscillation high-frequency signal by 1 / N (N is a positive integer), and varies the frequency of the oscillation high-frequency signal according to the phase difference. 4. A reference signal generator in a magnetic recording apparatus according to claim 1, wherein said reference signal generator is formed so as to divide the frequency into 1 / M (M is a positive integer) and to output it as said reference signal. . The reference signal generator according to any one of claims 1 to 4, wherein the reference signal is a reference signal for recording a servo pattern signal on the tape-shaped recording medium. The reference signal generator according to claim 1, wherein the reference signal is a signal for correcting travel of the tape-shaped recording medium.

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